Class 11

Dear Vivek!
To do weapon engineering you must b graduate as this is a post graduate courses. Do your B.Tech in Aerospace & aeronautics engineering into the specialization of 'Defense Technologies' and then apply for weapon engineering. Some of the major institutes in India are:
1) Defense Institute of Advanced Technology, Pune,
2) Maharashtra Institute of Armament Technology, Pune
3) College of Military Engineering, Pune.
4) Defense Research and Development Organization. If you r wishing to go abroad (for which I am suggesting you as more career opportunities) are:
1) Cranfield Defense and Security, Shrivenham, UK
2) University of Leeds, UK
3) Taylors University, Malaysia
4) American Military University, USA
5) Naval Postgraduate School, USA
6) University of Wolverhampton, UK
7) Stevens Institute of Technology, USA
8) United States Naval Academy, USA
9) United States Military Academy, USA.
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Good luck buddy!